CVE-2019-12656

Cisco IOx Application Environment Denial of Service Vulnerability

HIGH
7.5
CVSS Score
Published: September 25, 2019 at 08:16 PM UTC
Updated: June 17, 2026 at 02:15 AM UTC
31 products affected across 1 vendorIOSCGR1000 FirmwareIndustrial Ethernet 2000 Series Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A vulnerability in the IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a DoS condition.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
cisco-cgr-1000 (same device)
All versions
cisco-ic3000 (same device)
All versions
cisco-ie-4000 (same device)
cisco-ie-2000-16ptc-g (environment) · cisco-ie-2000-16t67 (environment) · cisco-ie-2000-16t67p (environment) · cisco-ie-2000-16tc (environment) · cisco-ie-2000-16tc-g (environment) · cisco-ie-2000-16tc-g-e (environment) · cisco-ie-2000-16tc-g-n (environment) · cisco-ie-2000-16tc-g-x (environment) · cisco-ie-2000-24t67 (environment) · cisco-ie-2000-4s-ts-g (environment) · cisco-ie-2000-4t (environment) · cisco-ie-2000-4t-g (environment) · cisco-ie-2000-4ts (environment) · cisco-ie-2000-4ts-g (environment) · cisco-ie-2000-8t67 (environment) · cisco-ie-2000-8t67p (environment) · cisco-ie-2000-8tc (environment) · cisco-ie-2000-8tc-g (environment) · cisco-ie-2000-8tc-g-e (environment) · cisco-ie-2000-8tc-g-n (environment)
All versions
cisco-ir510-wpan (same device)
All versions
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20NVD-CWE-noinfo

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